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<p>[QUOTE=&quot;-jeffB, post: 4658642, member: 27832&quot;]And even that will start absorbing water as soon as you pour it and get humid air into the bottle. Not much, and not quickly, if you keep the bottle tightly closed when you aren&#039;t actually pouring it. </p><p><br /></p><p>Or you can dry it. Dump some <a href="https://www.bio.umass.edu/microscopy/mol_sieves.htm" target="_blank" class="externalLink ProxyLink" data-proxy-href="https://www.bio.umass.edu/microscopy/mol_sieves.htm" rel="nofollow">3A molecular sieves</a> into it, and it&#039;ll be plenty dry -- again, until you pour it into a container holding your coin. (Watch out for ceramic dust, too.)</p><p><br /></p><p>Really, unless you do all your work inside a glovebox filled with dry gas, you&#039;ll have some water in the acetone. It almost certainly doesn&#039;t matter. That small amount of water doesn&#039;t substantially interfere with the acetone&#039;s solvent properties, and the acetone takes it along when it evaporates.[/QUOTE]</p><p><br /></p>

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